The picture you indicated showed the clock missing, that mixed with the blue screen of death indicates to me that the computer is either having a software error or has a nasty virus.
I would first download and rune AVG anti virus (Free) and do a total scan of your computer. You might need to do this in safe mode.
Then I would scan and repair your registry fixing any errors that it comes up with.
Then the last thing I would suggest would be to repair windows with the original disk like Mak213 already indicated.
All of these should fix any software errors you might have.
If they all fail then I would restore your computer back to a date it was working or just wipe everything and do a clean install of windows.
I really do not think this is a graphics card issue.
I would first download and rune AVG anti virus (Free) and do a total scan of your computer. You might need to do this in safe mode.
Then I would scan and repair your registry fixing any errors that it comes up with.
Then the last thing I would suggest would be to repair windows with the original disk like Mak213 already indicated.
All of these should fix any software errors you might have.
If they all fail then I would restore your computer back to a date it was working or just wipe everything and do a clean install of windows.
I really do not think this is a graphics card issue.